I have done the same, I was in a noisy job so wore earmuffs most of the day, I think this has made my T more reactive over the years, driving on the open road is a similar problem as in old NZ with our cheap rough chip roads, I've taken out countless vehicles and the quietest are late model 4x4 utes (Ford and VW) but still around 70db. I wear noise cancelling headphones when I drive on the open road, these are great for taking out the road roar but you can still have a converstaion, $500 though.